Specifications

AT1800 Series
At 180 Watts RMS per channel, the AT1800 Series provides the best price to
performance ratio of any amplifers available. Sharing many of the same
characteristics of its bigger brothers, the AT3000/AT2000 Series, this amplifier
is capable of delivering the levels of power and high current performance
found only in amplifiers costing thousands more.
The AT1800 series comprises six amplifier models, all identical except for
the number of channels. The series starts with the two-channel AT1802, and
finishes with the seven-channel AT1807. The amplifiers are modular; each channel resides
on a separate, plug-in circuit board, so increasing the number of channels is easy.
Like all other ATI amplifiers, the AT1800-series amps are cooled by large heat sinks, not by
cooling fans. This feature may be especially important in this amplifier, which is likely to
find use in many home theater systems that do not hide the equipment in a rack or closet.
You can set this amp right next to your favorite listening chair without having to worry
about fan noise. An optically-coupled protection circuit automatically shuts down the
amplifier in an overload situation, such as when someone accidentally cuts into a speaker
cable and shorts out the amp. Once the protection circuit is engaged, it checks the
conditions every 10 seconds, and restores output automatically when the overload
situation is remedied. The protection circuit is optically coupled to the audio circuit;
because there’s no direct electrical connection, the protection doesn’t affect sound quality.
A magnetic circuit breaker provides further protection and eliminates the need for
cumbersome fuses.
9
Back panel of the AT1807
The AT1800-series amps use the same transformer
construction as the top-of-the-line AT3000
and AT2000 series amps: MOH cores with
bifilar windings, built in our own factory.
It also uses double-sided glass epoxy
circuit boards and the same rugged,
powder-coated chassis used in
all our products.
Even the AT1807,
with 1,260 total
watts, will not trip
your household
circuit breaker or dim
the lights when you switch
it on. High power amps draw
a momentary—but tremendous—
inrush of electrical current when you
turn them on. The AT1800-series amps do
not, thanks to ATI’s Ultra Soft Turn-On circuit.
This cir
cuit gradually powers up the amp, to ease
t
he load on y
our household cir
cuits. And t
he am
p
includes a trigger input that allows it to be turned on
and of
f.
For the best value in a basic home theater amplifier,
no
t
hing beats A
TI’s AT1800-series amps.
A
T1
800 Ser
ies
2 to 7 Channels
1
80 W
atts/Ch
(8 Ohms)
270 Watts/Ch
(4 Ohms)
An inside look at the
AT1807 7-channel
power amplifier
AT1800 Series
power amplifier